The correct answer is - decreasing water supply to nations that are not in compliance with the United Nations.
The conservation of freshwater is crucial for the existence for the human kind, as well as for big portion of the flora and fauna worlds. But in way the conservation should be selective and inhumane towards certain nations, or rather the people in their nations, especially not if their governments have some issues with some of the world organizations, since it is not the ordinary people that lead the politics.